CN214952773U - Fatigue test system based on stress and frequency threshold - Google Patents
Fatigue test system based on stress and frequency threshold Download PDFInfo
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- CN214952773U CN214952773U CN202121186435.1U CN202121186435U CN214952773U CN 214952773 U CN214952773 U CN 214952773U CN 202121186435 U CN202121186435 U CN 202121186435U CN 214952773 U CN214952773 U CN 214952773U
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Abstract
The utility model provides a fatigue test system based on stress and frequency threshold, include: the at least two clamp assemblies are connected with the vibration test bed; the test piece is connected with the clamp assembly; the strain gauge is arranged in a test area of the test piece and is connected with the stress collector; the sensor is arranged on the surface of the test piece and is connected with the modal analyzer; the vibration test bed applies load to the test piece through sine fixed frequency; the stress collector is used for collecting the stress change of the test piece through the strain gauge; the modal analyzer is used for analyzing the frequency change of the test piece through the sensor. The utility model discloses a set up a plurality of anchor clamps subassemblies, realized testing a plurality of test pieces simultaneously to through the sinusoidal fixed frequency test under a certain frequency, exert different loads to the test piece, realize the discernment of test piece fatigue damage with the help of two indexes of stress variation and frequency variation.
Description
Technical Field
The utility model relates to the technical field of materials, especially, relate to a fatigue test system based on stress and frequency threshold value.
Background
Fatigue failure is the most common failure mode of materials, so the research on the fatigue life of the materials is particularly important. At present, the fatigue test method at home and abroad adopts a conventional MTS fatigue testing machine, clamps are utilized to clamp two ends of a test piece and apply an acting force F, a nominal stress is obtained by dividing a loading force by an area, meanwhile, the test times are recorded, and the test is carried out until the test piece is broken. But each test can only test one sample piece, a plurality of sample pieces cannot be simultaneously carried out, and the test period is long. And because the nominal stress is calculated, the test precision is poor, and the influence of the frequency on the fatigue life is not considered.
SUMMERY OF THE UTILITY MODEL
The utility model provides a fatigue test system based on stress and frequency threshold value, be used for solving among the prior art at every turn experimental sample piece that can only be tested, can't carry out a plurality of sample pieces simultaneously, and the defect of experimental cycle length, through setting up a plurality of anchor clamps subassemblies, it tests simultaneously to a plurality of test pieces to have realized, and through the sinusoidal fixed frequency test under a certain frequency, apply different loads to the test piece, realize the discernment of test piece fatigue damage with the help of two indexes of stress variation and frequency variation, according to fatigue number of times under corresponding load stress, can draw fatigue life S-N curve under a certain frequency, also can explore the influence of different frequencies to structure fatigue characteristic.
According to the utility model provides a pair of fatigue test system based on stress and frequency threshold, include: the device comprises a vibration test bed, a clamp assembly, a test piece, a strain gauge, a sensor, a stress collector and a modal analyzer;
at least two of the clamp assemblies are connected with the vibration test bed;
the test piece is connected with the clamp assembly;
the strain gauge is arranged in a test area of the test piece and is connected with the stress collector;
the sensor is arranged on the surface of the test piece and is connected with the modal analyzer;
the vibration test bed applies load to the test piece through sine fixed frequency;
the stress collector is used for collecting the stress change of the test piece through the strain gauge;
the modal analyzer is used for analyzing the frequency change of the test piece through the sensor.
According to the utility model discloses an embodiment, it is a plurality of the anchor clamps subassembly sets up along closed loop path interval.
In particular, the present embodiment provides an embodiment in which the clamp assembly is disposed on the vibration testing stand in a manner such that the closed loop path may be understood as a circular or elliptical path, with the particular arrangement being dependent upon the size of the vibration testing stand and the associated testing requirements.
According to the utility model discloses an embodiment, it is a plurality of the anchor clamps subassembly sets up along ring-opening route interval.
In particular, the present embodiment provides another form of implementation of the clamp assembly on the vibration testing stand, and the open loop path may be understood as a straight path or a circular arc path, the specific arrangement being determined according to the size of the vibration testing stand and the related testing requirements.
According to the utility model discloses an embodiment, the foil gage with between the testpieces, realize connecting through the mode of bonding or magnetism absorption.
Specifically, this embodiment provides an implementation mode that foil gage and test piece are connected, connects through standing street or the mode of magnetism between foil gage and the test piece, and the relative position between can be more nimble according to the test area regulation foil gage of test piece and the test piece realizes the test to the different regions of test piece.
According to the utility model discloses an embodiment, the sensor with between the test piece, realize connecting through the mode of bonding or screw thread.
Specifically, the present embodiment provides an implementation manner of connecting the sensor and the test piece, and since the mass of the sensor is larger than that of the strain gauge, a connection manner with better connection stability is required between the sensor and the test piece, and therefore, an adhesion or screw connection manner is adopted.
It should be noted that the threaded connection is understood to be a connection between the sensor and the test piece through the cooperation of the bolt and the thread.
According to the utility model discloses an embodiment, the anchor clamps subassembly includes: the clamping device comprises a bottom plate, a clamping plate and a positioning piece;
the bottom plate is connected with the vibration test bed;
the clamping plate comprises a first clamping surface and a second clamping surface which are connected with each other;
one side end of the first clamping surface is connected with the bottom plate, the other side end of the first clamping surface is connected with the second clamping surface, and the first clamping surface and the second clamping surface are connected to form an L-shaped structure;
the positioning piece is in threaded connection with the second clamping surface and used for positioning the test piece.
Particularly, this embodiment provides an implementation mode of anchor clamps subassembly, through refining the anchor clamps subassembly, provides the assurance for the connection of test piece on vibration test bench, and the setting element passes through the screw thread to be connected with the second clamping face, has also further guaranteed the stability of relative position between test piece and the vibration test bench.
It should be noted that the positioning member may be a bolt or the like having a thread.
According to an embodiment of the present invention, a groove is provided on one side of the second clamping surface;
the test piece is inserted into the groove;
the positioning piece enters the groove from one side arm of the groove and is abutted to the test piece.
Particularly, this embodiment provides an embodiment that second clamping face and test piece are connected, has promoted the stability of being connected between test piece and the grip block through setting up the recess, avoids in the test process, because the test error that the poor stability of being connected leads to between test piece and the grip block.
According to the utility model discloses an embodiment still includes: the sliding rail is arranged on the surface of the vibration test bed;
the bottom plate is connected with the slide rail in a sliding manner.
Particularly, this embodiment provides an implementation mode that sets up the slide rail on vibration test platform surface, through setting up the slide rail, has realized the regulation of bottom plate at vibration test platform surface position, can select the distribution of bottom plate according to the demand, avoids the problem that the test piece interval is undersized or the interval is too big.
According to the utility model discloses an embodiment, the anchor clamps subassembly includes two the grip block, two the grip block interval sets up, two tip that the test piece is relative are relative with two respectively the second clamping face is connected.
Particularly, this embodiment provides an embodiment of grip block, through setting up two grip blocks, has both satisfied the experimental demand to test piece one end location, has also satisfied the experimental demand to test piece both ends location, provides the scheme of multiple location test piece.
According to the utility model discloses an embodiment, two relatively the interval is adjustable between the grip block.
Specifically, the present embodiment provides another embodiment of the clamping plates, and the clamping of the test pieces with different sizes can be realized by adjusting the distance between the two clamping plates.
In an application scene, a corresponding sliding structure can be arranged between the bottom plate and the clamping plates, so that the relative position between the clamping plates and the bottom plate can be adjusted, and further the relative position between the two clamping plates can be adjusted.
In another application scene, the two clamping plates can be connected through the screw rod, the screw rod is provided with left-handed threads and right-handed threads, and the two threads with opposite rotation directions are respectively matched with the clamping plates, so that the relative position between the two clamping plates can be adjusted through the screw rod.
The utility model provides an above-mentioned one or more technical scheme has one of following technological effect at least: the utility model provides a pair of fatigue test system based on stress and frequency threshold value, through setting up a plurality of anchor clamps subassemblies, realized testing a plurality of test pieces simultaneously, and through sinusoidal fixed frequency test under a certain frequency, exert different loads to the test piece, realize the discernment of test piece fatigue damage with the help of two indexs of stress variation and frequency variation, according to fatigue number of times under corresponding load stress, can draw fatigue life S-N curve under a certain frequency, also can explore the influence of different frequencies to structural fatigue characteristic.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is one of the assembly relationship diagrams of a fatigue testing system based on stress and frequency thresholds provided by the present invention;
fig. 2 is a second schematic diagram of the assembly relationship of the fatigue testing system based on stress and frequency threshold provided by the present invention;
FIG. 3 is one of the schematic diagrams of the assembling relationship of the clamp assembly in the fatigue testing system based on stress and frequency threshold provided by the present invention;
fig. 4 is a second schematic diagram of the assembly relationship of the clamp assembly in the fatigue testing system based on stress and frequency threshold provided by the present invention;
fig. 5 is a third schematic view of an assembly relationship of the clamp assembly in the fatigue testing system based on stress and frequency threshold provided by the present invention;
fig. 6 is a schematic diagram of the arrangement relationship between the strain gauge and the sensor in the fatigue testing system based on stress and frequency threshold provided by the present invention.
Reference numerals:
10. a vibration test bed; 11. A slide rail; 20. A test piece;
30. a strain gauge; 40. A sensor; 50. A stress collector;
60. a modal analyzer; 70. A base plate; 80. A clamping plate;
81. a first clamping surface; 82. A second clamping surface; 83. A groove;
90. a positioning member.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In some embodiments of the present invention, as shown in fig. 1-6, the present solution provides a fatigue testing system based on stress and frequency thresholds, comprising: the device comprises a vibration test bed 10, a clamp assembly, a test piece 20, a strain gauge 30, a sensor 40, a stress collector 50 and a modal analyzer 60; at least two clamp assemblies are connected with the vibration test bed 10; the test piece 20 is connected with the clamp assembly; the strain gauge 30 is arranged in a test area of the test piece 20 and is connected with the stress collector 50; the sensor 40 is arranged on the surface of the test piece 20 and is connected with the modal analyzer 60; wherein, the vibration test bed 10 applies load to the test piece 20 through sine fixed frequency; the stress collector 50 is used for collecting the stress change of the test piece 20 through the strain gauge 30; the mode analyzer 60 is used to analyze the frequency change of the test piece 20 by the sensor 40.
In detail, the utility model provides a fatigue test system based on stress and frequency threshold value, be used for solving among the prior art at every turn experimental sample piece that can only test, can't carry out a plurality of sample pieces simultaneously, and the defect of experimental cycle length, through setting up a plurality of anchor clamps subassemblies, it tests simultaneously to a plurality of test pieces 20 to have realized, and through sinusoidal fixed frequency test under a certain frequency, apply different loads to test piece 20, realize the discernment of test piece 20 fatigue damage with the help of two indexes of stress variation and frequency variation, fatigue number of times under corresponding load stress, can draw fatigue life S-N curve under a certain frequency, also can explore the influence of different frequencies to structural fatigue characteristic.
In some possible embodiments of the present invention, the plurality of clamp assemblies are spaced apart along the closed loop path.
In particular, the present embodiment provides an embodiment in which the clamp assembly is disposed on the vibration testing stand 10 in a manner such that the closed loop path may be understood as a circular or elliptical path, depending on the size of the vibration testing stand 10 and the associated testing requirements.
In some possible embodiments of the present invention, the plurality of clamp assemblies are spaced apart along the open loop path.
Specifically, the present embodiment provides another form of implementation of the clamp assembly on the vibration testing stand 10, and the open loop path may be understood as a straight path or an arc path, the specific arrangement being determined according to the size of the vibration testing stand 10 and the related testing requirements.
In some possible embodiments of the present invention, the connection between the strain gauge 30 and the test piece 20 is achieved by adhesion or magnetic attraction.
Specifically, the strain gauge 30 is connected with the test piece 20 in a standing street or magnetic attraction manner, so that the relative position between the strain gauge 30 and the test piece 20 can be adjusted more flexibly according to the test area of the test piece 20, and tests on different areas of the test piece 20 can be realized.
In some possible embodiments of the present invention, the connection between the sensor 40 and the test piece 20 is achieved by means of bonding or threads.
Specifically, the present embodiment provides an embodiment in which the sensor 40 is connected to the test piece 20, and since the mass of the sensor 40 is larger than that of the strain gauge 30, a connection method with better connection stability is required between the sensor 40 and the test piece 20, and thus, an adhesive or a screw connection method is adopted.
It should be noted that the threaded connection is understood to be a connection between the sensor 40 and the test piece 20 through the cooperation of a bolt and a thread.
In some possible embodiments of the present invention, the clamp assembly includes: a bottom plate 70, a clamping plate 80, and a positioning member 90; the bottom plate 70 is connected with the vibration test bed 10; the clamping plate 80 includes a first clamping face 81 and a second clamping face 82 connected to each other; one side end of the first clamping surface 81 is connected with the bottom plate 70, the other side end of the first clamping surface 81 is connected with the second clamping surface 82, and the first clamping surface 81 and the second clamping surface 82 are connected to form an L-shaped structure; the positioning member 90 is threadedly coupled to the second clamping surface 82 for positioning the test piece 20.
Specifically, the present embodiment provides an embodiment of a clamp assembly, which provides a guarantee for the connection of the test piece 20 on the vibration testing platform 10 through the refinement of the clamp assembly, and the positioning member 90 is connected with the second clamping surface 82 through a screw thread, so as to further guarantee the stability of the relative position between the test piece 20 and the vibration testing platform 10.
It should be noted that the positioning member 90 may be a bolt or the like having a thread.
In some possible embodiments of the present invention, one side of the second clamping surface 82 is provided with a groove 83; the test piece 20 is inserted in the groove 83; the positioning member 90 enters the recess 83 from one side arm of the recess 83 and abuts against the test piece 20.
Particularly, the embodiment provides an embodiment that second clamping face 82 is connected with testpieces 20, has promoted the stability of being connected between testpieces 20 and the grip block 80 through setting up recess 83, avoids in the experimentation, because the poor experimental error that leads to of stability of being connected between testpieces 20 and the grip block 80.
In some possible embodiments of the present invention, the method further comprises: the sliding rail 11 is arranged on the surface of the vibration test bed 10; the bottom plate 70 is slidably connected to the slide rail 11.
Specifically, the embodiment provides an implementation mode in which the slide rail 11 is arranged on the surface of the vibration test bed 10, and by arranging the slide rail 11, the adjustment of the position of the bottom plate 70 on the surface of the vibration test bed 10 is realized, the distribution of the bottom plate 70 can be selected according to requirements, and the problem that the intervals of the test pieces 20 are too small or too large is avoided.
In some possible embodiments of the present invention, the clamp assembly includes two clamping plates 80, the two clamping plates 80 are spaced apart, and two opposite ends of the test piece 20 are respectively connected to two opposite second clamping surfaces 82.
Particularly, the embodiment of the clamping plate 80 is provided, and by providing two clamping plates 80, the test requirement for positioning one end of the test piece 20 is met, the test requirement for positioning two ends of the test piece 20 is also met, and a scheme for positioning the test piece 20 is provided.
In some possible embodiments of the present invention, the distance between the two opposite clamping plates 80 is adjustable.
Specifically, the present embodiment provides another embodiment of the clamping plates 80, and the clamping of the test pieces 20 with different sizes can be realized by adjusting the distance between the two clamping plates 80.
In an application scenario, a corresponding sliding structure may be disposed between the bottom plate 70 and the clamping plate 80, so as to adjust the relative position between the clamping plate 80 and the bottom plate 70, and further adjust the relative position between the two clamping plates 80.
In another application scenario, the two clamping plates 80 can be connected through a screw, a left-handed thread and a right-handed thread are arranged on the screw, and the two threads with opposite rotation directions are respectively matched with the clamping plates 80, so that the relative position between the two clamping plates 80 can be adjusted through the screw.
In the fatigue test scene of a stress and frequency threshold value, the utility model discloses to prior art's not enough, disclose a fatigue test system based on stress and frequency threshold value, can be accurate, quick, the automatic calculation fatigue life, this method not only limits to dynamic stress and calculates to also have use value to other test data etc.. The utility model discloses select under the resonant frequency of certain trade mark steel, the fatigue test under the 320Mpa stress of maximum dangerous stress as an example, its concrete step is as follows:
step one, mounting the test piece 20: the setting of anchor clamps subassembly and test piece 20 is carried out according to vibration test bench 10 interface, and the test bench passes through annular or straight line distribution's slide rail 11 with the anchor clamps subassembly and is connected, in this experiment, only sets up a set of bottom plate 70 and grip block 80, and the test piece 20 stiff end is connected with the setting element 90 that the anchor clamps subassembly passes through grip block 80 and, and the free end of test piece 20 carries out the counter weight through bolt and nut, and 16 test pieces 20 can be loaded simultaneously to the test bench, and 4 test pieces 20 are assembled in this time experiment. And a strain gauge 30 is disposed at a dangerous position of each test piece 20, the bolt torque needs to be checked.
Step two, sine frequency sweeping: arranging a sensor 40 in the middle of the free end of each test piece 20, selecting acceleration amplitude of 0.1-500HZ and 1g to perform sine frequency sweep test, automatically processing acceleration data by software, and acquiring and recording the natural frequency of the test piece 20; all test pieces 20 should have a natural frequency within a certain range, otherwise the fastening bolt torque is adjusted or the cause of the inconsistency is looked for. The test frequency sweep results show that the natural frequency of 4 test pieces 20 is about 77.7. The average value of the test piece 20 is 77.6, and the consistency is better.
Step three, debugging and testing: a sine excitation waveform form is selected, the acceleration amplitude of the test bed is adjusted under the resonance frequency of 77.7HZ, when the acceleration controlled by the vibration test bed 10 is 1.6g, the stress response of each test piece 20 is monitored to reach about 380Mpa of the expected value of the most dangerous monitoring test piece 20, and the stress of all the test pieces 20 is basically consistent.
Step four, formal test: and on the basis of the debugging test in the third step, keeping the test bed applying an acceleration of 1.6g to the clamp, and recording and monitoring the stress value change of the most dangerous part of the test piece 20 in real time. The initial stress value of the test is 380Mpa, when the change of the stress value of the test piece 20 is more than or equal to 25%, the system automatically stops the fatigue test under sine excitation, the system automatically enters a sine frequency sweeping mode, if the frequency is decreased by more than or equal to 3%, the secondary judgment and confirmation of the fatigue damage are carried out by using the frequency decreasing index, the occurrence of misjudgment is prevented, and the fatigue life S-N curve under the resonance frequency is drawn according to the test result.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the embodiments of the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Finally, it should be noted that: the above embodiments are merely illustrative, and not restrictive, of the present invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalent substitutions may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and all of the technical solutions should be covered by the scope of the claims of the present invention.
Claims (10)
1. A fatigue testing system based on stress and frequency thresholds, comprising: the device comprises a vibration test bed, a clamp assembly, a test piece, a strain gauge, a sensor, a stress collector and a modal analyzer;
at least two of the clamp assemblies are connected with the vibration test bed;
the test piece is connected with the clamp assembly;
the strain gauge is arranged in a test area of the test piece and is connected with the stress collector;
the sensor is arranged on the surface of the test piece and is connected with the modal analyzer;
the vibration test bed applies load to the test piece through sine fixed frequency;
the stress collector is used for collecting the stress change of the test piece through the strain gauge;
the modal analyzer is used for analyzing the frequency change of the test piece through the sensor.
2. A stress and frequency threshold based fatigue testing system according to claim 1, wherein a plurality of said clamp assemblies are spaced along a closed loop path.
3. A stress and frequency threshold based fatigue testing system according to claim 1, wherein a plurality of said clamp assemblies are spaced apart along an open loop path.
4. The system of claim 1, wherein the strain gauge is connected to the test piece by adhesion or magnetic attraction.
5. A stress and frequency threshold based fatigue testing system according to claim 1, wherein the connection between the sensor and the test piece is realized by means of bonding or threads.
6. A stress and frequency threshold based fatigue testing system according to any of claims 1 to 5, wherein the clamp assembly comprises: the clamping device comprises a bottom plate, a clamping plate and a positioning piece;
the bottom plate is connected with the vibration test bed;
the clamping plate comprises a first clamping surface and a second clamping surface which are connected with each other;
one side end of the first clamping surface is connected with the bottom plate, the other side end of the first clamping surface is connected with the second clamping surface, and the first clamping surface and the second clamping surface are connected to form an L-shaped structure;
the positioning piece is in threaded connection with the second clamping surface and used for positioning the test piece.
7. A stress and frequency threshold based fatigue testing system according to claim 6, wherein one side of the second clamping surface is provided with a groove;
the test piece is inserted into the groove;
the positioning piece enters the groove from one side arm of the groove and is abutted to the test piece.
8. The stress and frequency threshold based fatigue testing system of claim 6, further comprising: the sliding rail is arranged on the surface of the vibration test bed;
the bottom plate is connected with the slide rail in a sliding manner.
9. The stress and frequency threshold based fatigue testing system of claim 6, wherein the clamp assembly comprises two clamping plates, the two clamping plates are arranged at intervals, and two opposite ends of the test piece are respectively connected with two opposite second clamping surfaces.
10. A stress and frequency threshold based fatigue testing system according to claim 9, wherein the spacing between the opposing clamping plates is adjustable.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114441278A (en) * | 2021-12-20 | 2022-05-06 | 中国商用飞机有限责任公司北京民用飞机技术研究中心 | Encapsulating method and device for composite material reinforced wall plate test piece for airplane |
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2021
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114441278A (en) * | 2021-12-20 | 2022-05-06 | 中国商用飞机有限责任公司北京民用飞机技术研究中心 | Encapsulating method and device for composite material reinforced wall plate test piece for airplane |
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